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Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - GM

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - GM

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Accessories and Parts 3025-P - Plugs into Brake Controller - Tekonsha
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Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash. 1-800-940-8924 to order Tekonsha accessories and parts part number 3025-P or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - GM. Accessories and Parts reviews from real customers.
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Tekonsha Accessories and Parts

  • Trailer Brake Controller
  • Wiring Adapter
  • Plugs into Brake Controller
  • Tekonsha
  • Vehicle Specific

Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash.


  • Adapter is wired for GM trucks and SUVs from 1999 to 2002
  • Wiring adapter eases installation of your electric brake controller
  • Custom connector end plugs into the electric junction box beneath the dash of your vehicle
  • Other end plugs into the back of your electric brake controller
    • Compatible time-delayed brake controllers: Draw-Tite Activator I (5100), Draw-Tite Activator II (5500), Draw-Tite Activator III (5520) and Tekonsha PowerTrac (39523)
    • Compatible proportional brake controllers: Tekonsha Prodigy (90185), Tekonsha P2 (90885), Tekonsha P3 (90195), Tekonsha Primus IQ (TK90160) and Tekonsha Voyager (39510)
  • Limited 1-year warranty

Installation of Tekonsha Brake Controller Adapter

Junction BoxBrake-Control Adapter Port

This adapter plugs into the port that is built into the electric junction box beneath your vehicle's dash. The black box is located to the left of the steering column, just above the carpet. To plug in the adapter, first remove the cover on the box. The adapter plugs into the second slot from the left, on the top row.

To install your electric brake controller you need to connect the wiring of the controller to your vehicle. Certain manufacturers offer pre-wired options, typically known as tow packages, wherein these wires are run for you from the dash to the trailer connector on the back of your vehicle. Often, a brake controller wiring harness is included with your tow package. This harness plugs into a port beneath your dash and connects to the four wires of the brake controller. If, however, you have a brake controller with a plug in place of the four loose wires, you can use the Tekonsha adapter.

This adapter requires no hardwiring. It is designed to plug directly into your electric brake controller for the simplest installation possible. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time and securely stow it away.

3025-P Tekonsha Brake Control Wiring Adapter with 2 Plugs

Item # 3025-P

Installation Details 3025-P Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - GM - 3025-P

Average Customer Rating:  4.9 out of 5 stars   (448 Customer Reviews)

Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash.

2002 Chevrolet Silverado

The hitch and controller was installed on a 2002 Chevy 2500HD. It took roughly 15 min to install the Tekonsha P3 Brake Controller, plug it in and program it. As far as the B&W Turnover Ball Hitch, I cut the hole in the bed and cut the heat shield out the day before while I was waiting for the hitch to arrive. The next day my parts arrived, I laid out all the parts to make sure everything was there and then started the install. I didn't want to cut the 1"x1/2" notch out of my fender well to get the angle iron in so I spent about 15 min. trying to get it up on top the frame from underneath the truck. A waste of time. Do like the instructions say, cut the notch and slide it straight across the top of the frame. It will save time and aggravation. After getting both braces in place I ran a piece of rope down thru the hole and pulled the hitch plate up into place and tied it off. I installed all the bolts finger tight, put the side plates on and tightened everything up. It looks nice and I saved myself a $435.00 installation fee. With out a lift and without taking my rear tires off it took about 3 1/2 hrs. to install by myself. The only thing I want to say to B&W is don't place the heavy metal hitch parts on the booklet with the packets of Lithium Grease in it, they bust as the picture shows. Last but not least, thank you Sherry for all your help with my order and getting it to me quick in such short notice. I really appreciated it.

Paul O.


Great, and no problems


Because my truck has the factory tow option, I was able to purchase this custom harness from etrailer for a very quick install. No wires to trace…. No splices…. Very simple. One end of the harness plugged in to a socket under the dash of my truck. The other end of the harness plugged into a socket on the back of the Teconsha P3. Wiring complete!!


The Tekonsha plug-in wiring adapter fit my 99 Silverado 1500 with not any issues at the fuse block. The length of the wire harness allowed me to install the brake controller in the CD storage for easy access and use.


Quality part. Just plug it in and go. No problems yet.

2002 Chevrolet Silverado

I had purchased an electric brake controller to install on my 2002 Chevrolet Silverado 1 ton. I am pretty tech savvy but the thought of wiring into my truck’s electrical system made me a little apprehensive. The thought of my trailer passing me on the road was very thought provoking. Then along comes the “Plug-in” adapter for the brake controller. A no-brainer. Plug into the controller, plug into truck fuse panel (in a specific marked location for the plug), and your ready to go. As I said, a no-brainer


Did not work. The trailer brakes only work if I use the manual application. They are not working if you just use the truck brake petal.

Etrailer Expert

Katrina B.


Uh oh, that is not good to hear. Let me get you over to our tech department for them to help you out.

2001 GMC Yukon

Arrived quickly and well packaged as always. Love ordering from
Have not installed yet but I'm sure it will all work great as always. Have had Tekonsha controllers on several of my and buddy's rigs, always reliable.


The Help & professionalism of Quinn F at etrailer was outstanding. He confirmed that the product was the best choice for my vehicle & purpose, his personal response & follow through impressed me (including an e-mail letting me know my parts were delivered a couple days early). I will definitely be using Quinn F at etrailerfor all my RV related needs.

2002 Chevrolet Suburban

Great service and delivery as always! Driving a 2002 Suburban pulling a 1996 trailer, it's always a challenge to find compatible parts but never at etrailer!


Replacement for another brake controller.
install. The new cable got rid of excess from previous install.
Both work great and it made a much neater job. As you can see, you can't even tell where the cable comes out of the fuse box!!

2005 Honda Civic

have decided that as unable to find suitiable place on Kerr lake, have not even pull camper out of yard, have not installed items bought to have breaking on truck would really like to return these to items and us this to buy trailer hitch for 2005 honda civic, thanks for your great service, did make repair to camper exhaust fan with parts if got for ya'll


Great product and it is exactly as it is described. I have a 15000lb fifth wheel and I need to be able to control it! I am positive that I bought the right product for that task. Stuyvesant, NY


Simple to install. Optimum length.



Works as planned. My old controller had to be adjusted for the load I used it with a car trailer. It is nice to not have to adjust the controller every time I load something on the trailer. Installation instructionsvideos right on as usual with etrailer.

by: had the items we needed at a reasonable price. The items shipped out quickly but unfortunately, got held up in USPS shipping. I emailed customer service about the delay; they responded promptly and to our great satisfaction. I believe takes customer service seriously which is rare in today's time. We will definitely visit again for our needs and highly recommend them to anyone.


It doesn't get any simpler than this! Called etrailer and told them what vehicles I had. Sara looked it up and three days later I had the parts. Took all of 10 minutes to install and then I went to pick up my new camper. Product worked just perfect. Great company!


Snapped together with that beautiful SNAP!!! sound we've all come to know and love. Amy was very helpful. Now I need some mirrors. Great service! Thanks etrailer, your the greatest.


Fast shipping and very easy install with the additional wiring harness. Will buy again

1999 Chevrolet Suburban

etrailer's instructions and videos are awesome.
was a breeze UNTIL I needed to locate the brake signal wire (cold side of brake switch) on my 1999 suburban. What a pain. the switch is not very accessible let alone there are a ton of white wires under the dash --along with an alarm.
Long story short, I found this in a GMC forum and it saved me big time:

"Under the dash, next to the emergency brake is a black convenience box. At the bottom of the box is the letters GRN, next to that is the letters NAT with a small recessed box with two male spade connectors. The spade on the right goes to the brake switch. The wire from the brake controller is terminated there."

Using the supplied probe tester I was able to verify this and finished up my installation. The Tekonsha Prodigy P3 controller works great.

Sean L.


The Tekonsha Prodigy P3 controller is still working great. I cant believe i didnt get one sooner. Easy to adjust on the fly and no issues at all.


The wiring connector from the brake controller to the factory truck wiring was a perfect match, Plug and play. The quality of the whole adapter from the wire to the connectors are first class. It saved me a lot of time from laying on my back trying to make wiring connections like I have done in the past. This plug allows me to swap my Tekonsha Prodigy 2 from my other truck in seconds.

I highly recommend this product to everyone that wants a first class product and friendly awesome service from the folks at e trailer. I am a return customer and plan to be one as long as I need trailer parts and accessories.



Everything is still working fine. I expect nothing less from etrailer. You have saved a lot of time with the products I have purchased from you.

2010 Chevrolet Suburban

Bought a new Primus IQ brake controller but it only came with a pigtail wiring that had to be spliced into my '01 Suburban. Ordered the direct fit wiring pigtail from and couldn't be more pleased! It literally took me less than 10 minutes to plug in the wiring and mount the brake controller.
Excellent customer service and very fast shipping! The kind of shopping experience that causes repeat business.
Thank you and customer rep Lexus for making everything so simple!

Guy M.


Excellent. No problems at all!

2000 Chevrolet Silverado

Wasn't quite as easy to install as expected. Needed an experienced mechanical eye hooked to a limber body to find the right plug in spot under the dash. Some debate on where on the dash to hang the brake box, but I went with where the holes already were. Those teeny screws are tricky to get in and really did require a 1/4" ratchet, my fingers couldn't do it. Simple procedure, but did need the right tools. Took about 25 minutes, but some of that was going for tools... YES I'D BUY IT AGAIN ! One detail I learned about after installation, NO FUSE in the truck for it to work off. Needs a 40 amp fuse, and I didn't have one. Something to consider if yer new brake ain't working...
sorry I do not have photo ability, if someone comes along, I'll ask them to take a pic.




2002 Chevrolet Silverado

fast and exactly what I wanted


Plug and play but my only concern is the lights on the Draw Tite stay on all the time concerned about a dead battery any ideas?

Etrailer Expert

Sierra K.


The Draw-Tite controller model # 5535 you purchased, will go into sleep mode eventually, at which the voltage draw is so negligible that you would need to leave the vehicle to sit for several months before needing to worry about the vehicles battery draining. This is done as a safety measure, so that you do not turn off the controller and forget to turn it back on before towing. If the vehicle will be left sitting for several months, you can unplug this harness from the controller, but do not forget to plug it back in next time you use the vehicle.

Jim M.


Thank you very much for the reply and the great service your company gives!

2002 GMC Yukon XL

I ordered this pigtail for my 02 yukon xl with factory tow package because I do not like splicing factory wiring. It really is just plug and play. I am very pleased with the customer service from pre-order questions to receiving the shipment in a timely manner. etrailer will be my choice for any additional trailer needs.

Kevin H.


Having this installed in my Yukon for well over a year, I am still very pleased. I have since bought several items from etrailer and will continue to do so. They are truly a great company to conduct business with.

2001 Chevrolet Suburban

Perfect length, plug it in, tie wrap wire up out of the way. Very happy with this easy install!
Installed on 2001 Chevrolet Suburban 2500

Show More Reviews

See what our Experts say about this Tekonsha Accessories and Parts

  • Will a Brake Controller Work with a Factory Installed 6-Way Trailer Connector on a Chevy Silverado
    A factory 6-Way is certainly not all that common but it will have a brake output circuit and plugging in a brake controller will work. But there may be some connections that you will need to make under the hood to make everything fully functional. I have included a link to our FAQ article that covers the under hood connections that you will need to perform if they are not completed already. Please note that on a 6-Way trailer connector there are 2 ways that it could be wired. The center...
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  • Troubleshooting Trailer Driver's Side Brake Light Going Dark When Brakes Are Applied
    Based on what you are describing this sounds like an issue with your ground. This issue is often caused by an insufficient ground or short to ground on your trailer or vehicle. Make sure your ground connections are secure on a clean, bare-metal surface. You can also inspect the ground wires to make sure there is not a short in the wire. I have attached a helpful article on troubleshooting 4-way wiring for your reference.
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  • Plug-In Adaptor for Installing Draw-Tite Activator II Brake Controller in 2001 Chevrolet Suburban
    As long as your 2001 Chevy Suburban has the factory 7-Way connector installed, the Tekonsha Plug-In Wiring Adapter # 3025-P is the correct harness for installing your Draw-Tite Activator II Trailer Brake Controller. This is a simple plug and play harness for easy installation. One end of the adapter will plug into the Activator II unit and the other end will connect to the built-in port beneath the vehicle's dash. I have attached the written installation details that you can also check out.
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  • Which Tekonsha Brake Controller Install Harness for 2005 GMC Sierra
    The # 3015-P and the # 3025-P are both very similar but for your 2005 GMC Sierra you SHOULD be using the 3015-P but since the difference is really just a wiring switch on the same connector it is possible yours may have already had that switch done. But at the end of the day if your controller is working fine with whichever harness I would just run that and not worry.
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  • Brake Controller Port Location for a 2000 GMC Sierra Pickup
    If your 2000 GMC Sierra is a Classic model, then it will not have a brake controller port. You will need to hardwire in the brake controller and run the wires back to the 7-Way. You would need a part # ETBC7 and some sort of a 4-Way connector. Then you would wire the brake controller to the 7-Way. If your truck is not a Classic model the port should be located underneath a black cover behind and to the left of the brake pedal. I have included a link to a video of a brake controller being...
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  • How Long is the Brake Controller Install Harness part # 3025-P
    I went out into our warehouse and measured one of the # 3025-P harnesses we have in stock and found it to be 31 inches.
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  • Where to Look for Factory Wiring on 2002 Chevy Silverado
    You are in the right spot in looking for the wiring on your 2002 Chevy Silverado. If you take a look at the accompanying cutout I added you can see that the wires - if present - will be found above the spare tire. The cutout I added is from a link to a help article on installing a brake controller in 1999-2006 Chevy/GMC pickups.
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  • Troubleshooting Open Ground Error Code for Brake Controller Install
    The "open ground" error code of a brake controller indicates that the controller is losing the ground connection to the vehicle battery which is the white wire. I'd double check you have the # 3025-P seated totally in the junction box as well as make sure there's not damage to the connector or the pins of it. Also check for corrosion and fix as needed. As far as tracking down the ground circuit on the truck wiring that might be challenging. An easier solution would be to run a jumper wire...
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  • After Towing Trailer with Running Lights On Running Lights and Cruise Control Went Out
    It is possible that there is a short in the harness # 3025-P. But first, make sure the red wire in the end of the harness that plugs into the truck is in the same location as the one in the picture I have included. If it is not in this location it will need to be moved there. To determine if it is the harness that is causing the problem you can disconnect it and see if the problem goes away. If it does then there is a problem with the harness or the controller and one or both would need...
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    Image 1 for
  • Troubleshooting Brake Controller Installation in 2001 Chevrolet Silverado
    A common cause for a trailer brake circuit to activate at full power is a corrosion issue in the vehicle 7-way socket and/or the trailer plug. Corrosion can build-up inside a connector or on its contacts. When this happens two separate circuits, like the brake circuit and the 12V trailer power circuit, can become bridged together. This would result in the always-on 12V circuit bleeding into the brake circuit which would result in full power reaching the electric brakes all the time. The...
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  • Location of Blue Electric Brake Wire to Connect to Brake Controller on 2001 Chevrolet Express
    The brake controller wire on your 2001 Chevrolet Express Van is one of 4 wires taped together under the van's dash near the emergency brake pedal. It's usually blue but it doesn't have to be since vehicle manufacturers do not have a standard that they have to follow for wire coloring. The wire will run back to the round 7-way trailer connector and plug into the backside of it in the 7 O'clock position.
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  • No Trailer Brakes After Brake Controller Install on a 2000 GMC Sierra
    It sounds like you are trying to install a brake controller on your 2000 GMC Sierra. If that is the case then there is actually a plug in adapter available like the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3025-P depending on what brake controller you have. If this is what you are using and you have a factory 7-way then the likely cause of your problem is a blown CHMSL fuse. If the trailer brakes works with the manual override but not with the brake pedal then...
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  • No Power on Brake Controller Red Wire
    What is the year, make, and model of the vehicle? The red brake controller wire should only be getting power when you step on the brake pedal. If you are not getting any power on that wire with the brake pedal depressed then you may have it attached to the wrong brake switch wire (if it is hardwired into the vehicle), the red wire is in the wrong location in the plug (if it is a plug in application) or you have a blown stop light or CHMSL fuse. I would need to know the year, make, and...
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  • Brake Controller Stoplight Switch Circuit of 2001 GMC Sierra 2500 Not Working
    This is a pretty common issue for GM trucks around the age of yours. It's the third brake light fuse of your 2001 GMC Sierra 2500 that is blown. When it goes the brake controller activation circuit stops working as well. You can test this really easily by pressing the brake and seeing if the third brake lights up on cab above truck bed.
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  • Mounting and Installation of an Electric Trailer Brake Controller in a 2000 GMC Yukon XL
    You have stumbled upon one of the great brake controller conundrums that is often overlooked; and that is where to mount the brake controller. There is no definitive answer but there are some criteria that you should follow that will help you choose the best location. You will want the controller within easy reach of the driver and in a place where it will not obscure the drivers view of the road. It will also need to be mounted within the ranges specified in the instructions (linked...
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  • Trailer Brake Controller Port Location, 1999 Chevy Silverado to Install Voyager Brake Controller
    In the power distribution box, located under the dash in the very back left corner, you will plug in the brake controller adapter, # 3025-P. You will want to plug it into the empty spot in the top row, second from the left. There may also be some connections that you will need to make under the hood of the truck to make everything fully functional. I have included a link to an FAQ article that explains the connections.
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  • Where Does the Plug From the Tekonsha Voyager Proportional Brake Controller # 39510 Plug Into
    The brake control adapter plug is located in the electrical junction box on the driver side, left of the brake pedal. Once you have the lid off of the junction box you will plug the Tekonsha Wire Replacement, part # 3025-P, in the second slot from the left on the top row. I attached a link to an FAQ article on installing a brake controller on 1999-2006 Chevy trucks for you to check out. In the FAQ you will find pictures of where the junction box is and which port to plug the # 3025-P into.
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  • Troubleshooting P-3 Brake Controller Installation on a 2001 Chevrolet 2500HD Cab and Chassis Model
    The issue may be that your 2001 Chevrolet 2500HD cab and chassis model has the plug for the brake controller, but the electric brake and power lead wires are not run for it. If you are not getting power to your factory brake controller plug, you will need to connect the blue electric brake wire and red power lead wire under your vehicle hood. First, you will remove the bracket in the corner that is closest to the driver to access the accessory fuse block. Once you reveal the fuse...
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  • Can Brake Controller Wiring Harness from 2001 Chevy Tahoe be Used in 2007 GMC Sierra Classic
    The 2007 GMC Sierra Classic uses the same brake controller wiring harness as the 2006 GMC Sierra, # 3015-P for a Tekonsha brake controller. The 2001 Chevy Tahoe uses a different harness, # 3025-P or # 3025-S. What you can do if you do not want to buy a new harness is move the wire locations on the end of the connector you have at the end that plugs into the vehicle. It should be configured like the picture I have included for your 2007 GMC Sierra Classic.
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  • Brake Controller Not Working with Brake Pedal on a 2004 Chevy Silverado 2500
    On your 2004 Chevy Silverado 2500 you will need to make sure that the red wire in the connector, # 3015-P, is in the correct place. If you are not using harness # 3015-P then that could be the problem. Make sure the end of your harness that plugs into the truck matches the picture I have included. You can also check the stop light and CHMSL fuses. A blown fuse can cause this issue. I have also included a link to a help article that could help because there are some under hood connections...
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  • Tekonsha Trailer Brake Wire Harness, # 3025-P, Recommendation for 2000 Chevy Truck
    The difference between the 3025-P and the 3015-P is the pin locations of the wires on the orange connector. The reason for this is because the orange connector on 3025-P is wired to work on most GM vehicles from 1999-2002, such as your 2000 Chevy Pickup. The 3015-P is wired to work on most GM vehicles from 2003-2006. The orange connector on both harnesses are the same, but the pin locations for the different wires are different. It sounds like you have 3015-P and the wires are not making...
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  • No Power on Red Brake Controller Wire when Brake Pedal Pressed on a 2013 Toyota Tundra
    The wiring harness you should be using on your 2013 Toyota Tundra is # 3040-P. While it is unlikely it is wired incorrectly it is possible. You can use your test light to test the connector on the vehicle (where 3040-P plugs into) and see if it has power when you step on the brake pedal. If it does then check to see if the red wire is connected in the corresponding location in the harness. If not you can move it. If there is no power then there is something amiss on the vehicle side that...
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  • Brakes Lose Power When Parking Lights are on With P3 Brake Controller on 2000 Chevrolet Silverado
    You are correct, GM did change the wiring configuration for the brake controller wiring adapter in 2003. The plug-in wiring adapter, # 3015-P, that you referenced is for most 2003 to 2006 GM trucks, which explains why you lose power to your brakes when using the parking lights. The adapter that comes wired for your 2000 Chevrolet Silverado is the Tekonsha Plug-In Wiring Adapter, # 3025-P. Instead of waiting a few days to receive the correct adapter, you could easily re-pin the adapter...
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    Image 1 for Image 2 for
  • Wiring a 2003 Chevrolet Kodiak C-5500 for a Brake Controller with Factory Style Wiring Harness
    When wiring the red brake switch wire on the brake controller you should use a circuit tester to determine the wire that goes hot only when the brake pedal is pressed. If you find a wire that has voltage on it before the brake pedal is pressed and then gets brighter when the brake pedal is pressed that is the wrong circuit and should not be used. If your Kodiak has the prewired connector under the dash for the Tekonsha Wire Replacement for GM Vehicles, 2003 - 2006, then this should be...
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